I can't stress enough - IMPACT TOOLS WON'T WORK ON FRONT AND REAR WINDOWS - and in some cars, they won't work on side windows. Follow the bubbles and try to open the door. You may need to wait for the water to rise before you can open the door. If you blow out a window while under waters, several tons of water are going to slam into you at once.
It's a low rate of survival situation, in all cases.